c-mack
there are quite a few advertising auction companies - behemoths and smaller specialty houses. High end material usually ends up there. In the northeast there are also advertising and paper shows of all kinds. Finally there's eBay. MOST OF THE TIME - interesting, aesthetically pleasing, and rarely encountered items won't fall through the cracks in any of those venues although walking a paper or trade card show would likely be the best place for a "find" in terms of valuation. The good news is there's all kinds of ways to collect endless categories at all price levels. The patient and knowledgeable buyer with a PLAN will get the most enjoyment whether significant and beautiful pieces or a run of magazine ads.
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